Question

problem 3: a car travels 5 meters in 2 seconds. the car then stays motionless for 2 seconds. it then moves forward at 3m/s for 2 seconds. last, the car moves 3 meters in the opposite direction in 4 seconds.
a. what is the velocity of the car for the first 2 seconds?
b. what is the velocity of the car from times 2 - 5 seconds?
c. what is the velocity of the car from times 5 - 10s?

Explanation:

Step1: Calculate velocity (first 2s)

$v = \frac{\Delta x}{\Delta t} = \frac{5\ \text{m}}{2\ \text{s}} = 2.5\ \text{m/s}$

Step2: Velocity (2-5s, motionless)

$\Delta x = 0\ \text{m}, v = \frac{0}{3\ \text{s}} = 0\ \text{m/s}$

Step3: Velocity (5-10s)

$v = \frac{-5\ \text{m}}{5\ \text{s}} = -1\ \text{m/s}$

Answer:

a. 2.5 m/s
b. 0 m/s
c. -1 m/s